…For example, the Earth is in a circular orbit around the Sun, with a radius of about 149.6 million km and a circular orbital speed of about 29.78 km/s. (2) Escape velocity Also known as the second cosmic velocity. If the speed increases beyond the circular orbital speed, the orbit becomes elliptical, the major axis gradually becomes longer, and finally it escapes the Earth's gravitational sphere. … *Some of the terminology that mentions "escape velocity" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…たとえば地球は太陽のまわりの円軌道上にあり,円軌道の半径は約1億4960万km,円軌道速度は約29.78km/sである。(2)脱出速度escape velocity いわゆる第二宇宙速度。円軌道速度を超えて速度を増していくと軌道は楕円になり,しだいに長軸が長くなってついには地球の重力圏を脱出するようになる。… ※「escape velocity」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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